Question

已知下列热化学反应方程式：

①Fe2O3(s)+3CO(g)═2Fe(s)+3CO2(g)；△H=－26.7 kJ/mol

②2Fe3O4(s)+ CO2(g)═3Fe2O3(s)+ CO(g)；△H=+50.75 kJ/mol

③3/2FeO(s)+1/2CO2(g)═1/2Fe3O4(s)+1/2CO(g)；△H=+18.25 kJ/mol

则反应Fe(s)+CO2 (g)= FeO(s)+CO(g)的焓变为

A．+7.28 kJ/mol B．-7.28 kJ/mol C．+43.65 kJ/mol D．-43.68 kJ/mol

Answer 1